federated sharing auto-complete, first step

Add cmdline key to show shipped/non-shipped apps only

Web UI uses Webdav instead of ajax/* calls

assume pgsql >=9 if checking the version fails

Unset `path` for shared with me

[Settings] Moved changedisplayname to usercontroller

Scrutinizer Auto-Fixes

[3rdparty] Bump for symfony/console-2.7.4

This will make sure the cached JS gets properly updated.
Also, since this is a bigger change it also qualifies for a version
increase :-)

This used to be done in the ajax download code. Now that single file
downloads are going through Webdav, the token handling needs to be done
here too.

This prevents double slashes that can mess up path comparisons in some
cases.

This makes it possible to also store custom properties passed through
the data object like tags or shareOwner.

The public page now uses the public.php/webdav endpoint.

Also enabled more file operations like rename, move, delete and create
folder from the public page, which are now all possible thanks to the
public.php/webdav endpoint.

- Add davclient.js lib
- Add es6-promise required by that lib
- Wrote IE8 workaround lib/shim for davclient.js

This commit consists of patches automatically generated for this project on https://scrutinizer-ci.com

dont die if the external storage backend doesn't exist

Killed the old static route to change a users display name and moved it
to a properly testable controller.